<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/Welcome' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>商品列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片区域 -->
        <el-card>
            <!-- 按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary"
                    @click="showAddCateDialog">添加分类</el-button>
                </el-col>
            </el-row>
            <!-- 列表区域 -->
            <tree-table
                class="TreeTable"
                :data="catelist"
                :columns="columns"
                :selection-type="false"
                :expand-type="false"
                show-index
                index-text="#"
                border
                :show-row-hover="false"
                >
                <template slot="isok" slot-scope="scope">
                    <i class="el-icon-success" v-if="scope.row.cat_deleted===false" style="color:lightgreen"></i>
                    <i class="el-icon-error" v-if="scope.row.cat_deleted===true" style="color:red"></i>
                </template>
                <template  slot="order" slot-scope="scope">
                  <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
                  <el-tag size="mini" v-if="scope.row.cat_level===1" type="success">二级</el-tag>
                  <el-tag size="mini" v-if="scope.row.cat_level===2" type="warning">三级</el-tag>
                </template>
                <template  slot="opt" slot-scope="scope">
                  <el-button size="mini" type="primary" ><i class="el-icon-edit" @click="showEditDialogVisible(scope.row.cat_id)"></i>编辑</el-button>
                  <el-button size="mini" type="danger"><i class="el-icon-delete" @click="removeCateById(scope.row.cat_id)"></i>删除</el-button>
                </template>
            </tree-table>
            <!-- 分页区域 -->
            <el-pagination
              @size-change="handleSizeChange"
              @current-change="handleCurrentChange"
              :current-page="querInfo.pagenum"
              :page-sizes="[3, 5, 10, 15]"
              :page-size="querInfo.pagesize"
              layout="total, sizes, prev, pager, next, jumper"
              :total="total">
            </el-pagination>
        </el-card>
        <!-- 添加分类的对话框 -->
        <el-dialog
          title="添加分类"
          :visible.sync="addCateDialogVisible"
          width="50%"
          @close='addCateDialogClosed'
          >
          <!-- 添加分类的表单 -->
          <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
            <el-form-item label="分类名称:" prop="cat_name">
              <el-input v-model="addCateForm.cat_name"></el-input>
            </el-form-item>
            <el-form-item label="父级分类:">
              <el-cascader
                v-model="selectedKeys"
                :options="parentCateList"
                :props="{
                  expandTrigger: 'hover',
                  value:'cat_id',
                  label:'cat_name',
                  children:'children'  }"
                  @change="parentCateChanged"
                  change-on-select
                  clearable>
                </el-cascader>
            </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="addCateDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addCate">确 定</el-button>
          </span>
        </el-dialog>
        <!-- 编辑分类的对话框 -->
        <el-dialog
        title="修改分类"
        :visible.sync="editDialogVisible"
        width="50%">
          <el-form
          :model="editForm"
          :rules="editFormRules"
          ref="editFormRef"
          label-width="70px" >
            <el-form-item label="分类名称" prop="cat_name">
              <el-input v-model="editForm.cat_name"></el-input>
            </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editRoleInfo">确 定</el-button>
          </span>
        </el-dialog>

    </div>
</template>

<script>
export default {
  data () {
    return {
      catelist: [],
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      total: 0,
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      addCateDialogVisible: false,
      // 添加分类表单数据
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      // 添加分类表单的验证规则
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      // 父级分类的列表
      parentCateList: [],

      selectedKeys: [],
      // 编辑分类对话框的显示与隐藏
      editDialogVisible: false,
      // 编辑表单
      editForm: {},
      // 编辑表单的验证规则
      editFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories', { params: this.querInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.catelist = res.data.result
      this.total = res.data.total
    },
    handleSizeChange (newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange (newPage) {
      this.querInfo.pagenum = newPage
      this.getCateList()
    },
    // 点击按钮展示添加分类对话框
    showAddCateDialog () {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    async getParentCateList () {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类列表失败')
      }
      this.parentCateList = res.data
    },
    // 选择项发生变化出发这个函数
    parentCateChanged () {
      // 如果selectedKeys中的length大于零
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
      } else {
        // 父级分类的id
        this.addCateForm.cat_pid = 0
        // 为当前分类的等级赋值
        this.addCateForm.cat_level = 0
      }
    },
    // 点击按钮，添加新的分类
    addCate () {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败')
        }
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()
    },
    // 点击按钮，显示编辑分类对话框
    async showEditDialogVisible (id) {
      const { data: res } = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('查询用户失败')
      }
      // console.log(res)
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 监听用户对话框的关闭事件
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 修改分类信息并提交
    editRoleInfo () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        // 发起提交分类信息
        const { data: res } = await this.$http.put(
          'categories/' + this.editForm.cat_id,
          {
            cat_name: this.editForm.cat_name
          })
        if (res.meta.status !== 200) {
          return this.$message.error('更新分类信息失败')
        }
        // 关闭对话框
        this.editDialogVisible = false
        // 刷新数据列表
        this.getCateList()
        // 提示修改信息成功
        this.$message.success('更新分类信息成功')
      })
    },
    // 删除分类
    async removeCateById (id) {
      // 弹框确认是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果用户确认删除，则返回值为字符串confirm
      // 如果用户取消删除，则返回值为字符串cancle
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除')
      }
      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除分类失败')
      }
      this.$message.success('删除分类成功')
      this.getCateList()
    }
  }
}
</script>

<style lang="less" scoped>
.TreeTable{
  margin-top: 10px;
}
.el-cascader{
  width:100%
}
</style>
